EXT Ferro USD 36 Fork & Arma MX Rear Shock Suspension Bundle

Transform your electric dirt bike with the ultimate factory suspension upgrade. By pairing the EXT Ferro USD 36 Inverted Front Fork with the EXT Arma MX Rear Shock, this package delivers unmatched front-to-rear hydraulic balance, structural stiffness, and custom-valved damping for extreme E-MX performance. Purpose-built specifically for the increased weight and high loads of electric motorcycles—not re-purposed downhill mountain bike parts—this combo eliminates harsh bottom-outs, flex, and chatter across all trail conditions.

Available directly at Electri Cycle Works with package savings, optional pre-installation services, and custom rider-weight spring setup, this bundle is compatible with Sur-Ron Light Bee X, Talaria Sting MX3/MX4/R, E-Ride Pro SS, Altis Sigma, and RAWRR Mantis platforms.

What’s Included in the  EXT Ferro USD 36 Bundle

• EXT Ferro USD 36 Inverted Front Fork (205mm Travel): Built with 36mm heat-treated chrome-moly steel stanchions, 7000-series alloy uppers, HS3 twin-air spring technology, and 3-way high-flow cartridge damping.

• EXT Arma MX Rear Shock (267x87mm / 10.5×3.5″): Built on a solid machined aluminum body with a heavy-duty 14mm steel shaft, 4-way independent adjustment (LSC, HSC, LSR, and HBC), and low reservoir pressure (55 PSI) for low friction and traction.

• Custom Lightweight Coil Spring: Includes one lightweight shock spring tailored to your rider weight and aggression level (options from 400 lbs to 650 lbs).

• E-Moto Specific Mounting Hardware: Includes model-specific hardware for direct bolt-on installation on Sur-Ron, Talaria, and E-Ride Pro models.

Key Performance Highlights

EXT Ferro USD 36 Front Fork Features

• HS3 Hybrid Air Spring System: Features twin positive air chambers paired with a self-equalizing negative chamber to maintain mid-stroke support while absorbing small chatter and preventing bottom-outs.

• 3-Way High-Flow Cartridge: Independent High-Speed Compression, Low-Speed Compression, and Rebound controls let you dial in precise front-end response.

• CGB Continuously Guided Bushing System: Super-long static overlap prevents bushing binding during heavy front-end impacts or hard cornering.

• Crown Options for All Wheel Sizes: Available in Flat Crown (optimized for 19″ stock wheels or 16″/17″ Supermoto setups) and Drop Crown (for 21″ front wheels or fixing lower front-end height on Talaria models).

EXT Arma MX Rear Shock Features

• 4-Way Damping Adjustability: Offers independent Low-Speed Compression (LSC), High-Speed Compression (HSC), Low-Speed Rebound (LSR), and Hydraulic Bottom-Out Control (HBC).

• Hydraulic Bottom-Out Control (HBC): Externally adjustable circuit ramps up hydraulic resistance in the final 15% of stroke, allowing you to run plusher coil spring rates without harsh bottom-outs.

• 14mm Heavy-Duty Chromed Steel Shaft: Built 50% thicker than standard mountain bike shock shafts to withstand intense side-loading force on e-moto swingarms.

• 55 PSI Low-Pressure Reservoir: Minimizes hysteresis and seal friction to maximize rear tire tracking and traction on loose terrain.

Optional Pre-Installation Service Package

Simplify your front fork installation with our Electri Cycle Works workshop pre-install service:

• Steerer tube precision-cut to direct-mount length.

• Star nut installed (or configured for stem locks upon request).

• Lower steer tube bearing greased and hydraulic-pressed onto the crown.

• Additional items needed for complete home installation: Steerer tube spacer set and a Boost axle spacer kit. (Note: If mounting on a Talaria MX4 or E-Ride Pro SS with a 220mm rotor, a 220mm brake adapter is required).

EXT Ferro USD 36 Detailed Specifications Matrix

Feature Category	EXT Ferro USD 36 Fork Specs	EXT Arma MX Shock Specs
Retail Bundle Price	Discounted Bundle Pricing (Check total savings at checkout)
Travel / Sizing	205 mm Front Travel (44 mm Offset)	267×87 mm (10.5×3.5″) Shock Dimensions
Stanchions / Shaft	36mm Heat-Treated Chrome-Moly (42CrMo4)	14mm Chromed Steel Shaft
Damping Architecture	High-Flow 3-Way Adjustable Cartridge	High-Flow 4-Way Adjustable Damper
Adjustability	High Compression, Low Compression, Rebound	HSC, LSC, Rebound, Hydraulic Bottom-Out (HBC)
Spring System	HS3 Hybrid Twin-Air Spring	Lightweight Steel Coil (400lb – 650lb options)
Brake Mount / Hardware	200mm Post Mount Disc	Spherical Bearing Eyelets + Bike Hardware
Axle / Mounting	∅20mm Twin Hex Floating Axle (Boost)	Model-Specific Frame Hardware Included
Weight	4,500 grams (9.9 lbs)	~820 grams (without spring)

Why Buy From Electri Cycle Works?

• Authorized EXT Dealer & Suspension Experts: Every shock and fork is backed by knowledgeable riders who can assist with spring selection, clicker settings, and setup advice.

• Pre-Set & Ready to Ride: Choose our install kit service to receive a pre-cut, pre-pressed fork that bolts up using basic garage hand tools.

• Salt Lake City Showroom & Fast Freight: Order online for quick shipping across North America or arrange direct pickup at our Salt Lake City location.

Frequently Asked Questions

Which crown option should I choose for the EXT Ferro USD 36 fork?

Choose the Flat Crown if running stock 19″ wheels, 16″/19″ setups, or 17″ Supermoto wheels. Choose the Drop Crown if running a 21″ front wheel or installing on a Talaria MX3/MX4/R to correct front-end geometry.

How do I select the right spring weight for the Arma MX Rear Shock?

As a general baseline: Riders under 140 lbs use 400 lb; 140–180 lbs use 450 lb; 180–210 lbs use 500 lb; 210–240 lbs use 550 lb; 240+ lbs use 600–650 lb. (Note: Add 1 spring rate higher for Talaria Sting MX4 models due to leverage ratios).

Is this bundle a direct bolt-on upgrade?

Yes! The Arma MX shock includes model-specific mounting hardware. The Ferro fork bolts on directly with a boost axle spacer kit and appropriate brake rotor adapter for 220mm rotors.